# CVE-2021-21877: Command injection in Lantronix

> Authenticated attackers can execute arbitrary commands on Lantronix devices via specially crafted HTTP GET requests.

- **Severity:** Critical 9.1 (`CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 22 Dec 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-vp3f-gm6v-2mg2

## What is CVE-2021-21877?

CVE-2021-21877 is a critical command injection vulnerability in Lantronix, published on 22 Dec 2021. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

Specially-crafted HTTP requests can lead to arbitrary command execution in “GET” requests. An attacker can make authenticated HTTP requests to trigger this vulnerability.

Weakness: CWE-78 (Improper Neutralization of Special Elements used in an OS Command)

## Which versions are affected by CVE-2021-21877?

It affects 1 product.


Products: Lantronix Premierwave 2050 Firmware.

## How do I fix CVE-2021-21877?

No fix has been published for CVE-2021-21877 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-21877 being exploited?

There is no known exploitation of CVE-2021-21877 in the wild and no public exploit code.

## Other vulnerabilities in Lantronix

- [CVE-2021-21872](https://insights.sbomify.com/CVE-2021-21872/): Command injection in Lantronix (critical 9.9)
- [CVE-2021-21881](https://insights.sbomify.com/CVE-2021-21881/): Command injection in Lantronix (critical 9.9)
- [CVE-2021-21882](https://insights.sbomify.com/CVE-2021-21882/): Command injection in Lantronix (critical 9.9)
- [CVE-2021-21883](https://insights.sbomify.com/CVE-2021-21883/): Command injection in Lantronix (critical 9.9)
- [CVE-2021-21889](https://insights.sbomify.com/CVE-2021-21889/): Memory corruption in Lantronix (critical 9.9)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-21877 and fix it if it is affected.

What it is: CVE-2021-21877 is a critical command injection vulnerability in Lantronix, published on 22 Dec 2021. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-21877 in the wild and no public exploit code.

Affected product: Lantronix. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2021-21877/ (Markdown: https://insights.sbomify.com/CVE-2021-21877/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-21877
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-21877
- OSV: https://osv.dev/vulnerability/CVE-2021-21877

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-21877/
Summaries are generated and may contain mistakes; the official description above is the record.